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On 07 June 2000, I said:
> Then I wrote a little C program (source attached) that does the
> equivalent of
Oops, forgot the attachment. Here 'tis.
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/*
* alt_ssh
*
* exec ssh with an alternate "identity" (key pair) -- needed since
* the CVS_RSH variable can't include options for the rsh-like
* command.
*
* GPW 2000/05/28
*
* $Id: alt_ssh.c,v 1.3 2000/06/07 13:54:19 gward Exp $
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main (int argc, char * argv[])
{
char * keyfile = "/.ssh/alt-identity";
char * keyfile_full;
char * home;
int num_args;
char ** ssh_args;
int i;
home = getenv("HOME");
keyfile_full = (char *) malloc (strlen(home) + strlen(keyfile) + 1);
assert (home != NULL && keyfile_full != NULL);
strcpy(keyfile_full, home);
strcat(keyfile_full, keyfile);
num_args = argc + 2; /* -i, identity-file */
ssh_args = (char **) calloc (num_args+1, sizeof(char *));
ssh_args[0] = "ssh";
ssh_args[1] = "-i";
ssh_args[2] = keyfile_full;
for (i = 3; i < num_args; i++)
ssh_args[i] = argv[i-2];
ssh_args[i] = NULL;
for (i = 0; i < num_args; i++)
{
printf(ssh_args[i]);
if (i < num_args)
printf(" ");
}
printf("\n");
execvp("ssh", ssh_args);
perror("couldn't exec ssh");
exit(1);
}
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